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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 212 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.91² =
  2. 2.51² =
  3. 3.69² =
  4. 4.89² =
  5. 5.31² =
  6. 6.89² =
  7. 7.19² =
  8. 8.59² =
  9. 9.89² =
  10. 10.21² =
  11. 11.79² =
  12. 12.59² =
  13. 13.89² =
  14. 14.49² =
  15. 15.69² =
  16. 16.31² =
  17. 17.91² =
  18. 18.59² =
  19. 19.49² =
  20. 20.59² =
  21. 21.21² =
  22. 22.79² =
  23. 23.21² =
  24. 24.41² =
  25. 25.89² =
  26. 26.19² =
  27. 27.69² =
  28. 28.29² =
  29. 29.61² =
  30. 30.69² =
  31. 31.69² =
  32. 32.71² =
  33. 33.59² =
  34. 34.49² =
  35. 35.51² =
  36. 36.29² =
  37. 37.61² =
  38. 38.79² =
  39. 39.79² =
  40. 40.19² =

Answer key

  1. 8281
  2. 2601
  3. 4761
  4. 7921
  5. 961
  6. 7921
  7. 361
  8. 3481
  9. 7921
  10. 441
  11. 6241
  12. 3481
  13. 7921
  14. 2401
  15. 4761
  16. 961
  17. 8281
  18. 3481
  19. 2401
  20. 3481
  21. 441
  22. 6241
  23. 441
  24. 1681
  25. 7921
  26. 361
  27. 4761
  28. 841
  29. 3721
  30. 4761
  31. 4761
  32. 5041
  33. 3481
  34. 2401
  35. 2601
  36. 841
  37. 3721
  38. 6241
  39. 6241
  40. 361

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